1.Suitable for indoor and outdoor for any occasions,when indoor use, just remember to put the solar panel outside to absorb the sunlights. Light sensor controls the solar string lights auto on at dark and auto off at daytime. 2.These lights are not fully charged upon arrival, please put them under the sun for direct sun exposure to get fully charged. Make sure charged for no less than 6 hrs of direct sun light during the day. 3.Each piece is equipped with a powerful lithium solar battery that charges with solar energy during the day and provides power for the LED bulbs at night. After full charging, the solar garden light can reach a running time of about 6-8 hours. Thanks to the integrated light sensor, the lights switch on automatically at night and off during the day. 4.Note:①Before the first use, please make sure the solar light can be charged with sufficient sunlight for 12 hours.②In winter, the solar light is not able to be fully charged for the lack of light. So it's normal if the solar light is not bright enough and illumination time is short. Light time depends on how much it is charged during the daytime.③The solar light should be installed in places where sufficient sunshine is available.